Typo Error in Documentation: Incorrect Hyperlink in Launching Pad Sec…

…tion

## Description
<!--- Describe your changes in detail -->
I found a typo in the documentation listed on the main page (https://pyswarms.readthedocs.io/en/latest/) under the Launching Pad section. The hyperlink provided to `use-cases examples` is incorrect.

## Related Issue
Fixes ljvmiranda921#524

## Motivation and Context


## How Has This Been Tested?
Removed the `examples` from the hyperlink and the webpage redirects to use cases correctly.

## Screenshots (if appropriate):

## Types of changes
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- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)

## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
- [ ] My code follows the code style of this project.
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have read the **CONTRIBUTING** document.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

Fixes ljvmiranda921#524 <!--- Replace 524 with the appropriate issue number -->

docs/index.rst

@@ -42,7 +42,7 @@ interaction with swarm optimizations. Check out more features below!
 Launching pad
 -------------
 
-* If you don't know what Particle Swarm Optimization is, read up this short `Introduction <http://pyswarms.readthedocs.io/en/latest/intro.html>`_! Then, if you plan to use PySwarms in your project, check the `Installation guide <https://pyswarms.readthedocs.io/en/latest/installation.html>`_ and `use-case examples <https://pyswarms.readthedocs.io/en/latest/examples/usecases.html>`_.
+* If you don't know what Particle Swarm Optimization is, read up this short `Introduction <http://pyswarms.readthedocs.io/en/latest/intro.html>`_! Then, if you plan to use PySwarms in your project, check the `Installation guide <https://pyswarms.readthedocs.io/en/latest/installation.html>`_ and `use-case examples <https://pyswarms.readthedocs.io/en/latest/usecases.html>`_.
 
 * If you are a researcher in the field of swarm intelligence, and would like to include your technique in our list of optimizers, check our `contributing <https://pyswarms.readthedocs.io/en/latest/contributing.html>`_ page to see how to implement your optimizer using the current base classes in the library.